class Settings:
    """A class to store all settings for Alien Invasion."""

    def __init__(self):
        """Initialize the game's static settings."""
        # Screen settings
        self.fleet_size = 4
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (230, 230, 230)

        # Ship settings
        self.ship_limit = 3

        # Bullet settings
        self.bullet_width = 15
        self.bullet_height = 40
        self.bullet_color = (60, 60, 60)
        self.bullets_allowed = 30

        # Alien settings
        self.fleet_drop_speed = 10

        # How quickly the game speeds up
        self.speedup_scale = 1.0
        # How quickly the alien point values increase
        self.score_scale = 1.5

        self.initialize_dynamic_settings()

        # 外星人飞船射击频率(单位毫秒)
        self.alien_fire_rate = 1400

        # 图片位置路径,设置成静态变量
        self.image_base_path = 'exp2/images/'

    def initialize_dynamic_settings(self):
        """Initialize settings that change throughout the game."""
        self.ship_speed = 10
        self.bullet_speed = 14
        self.alien_speed = 1.0

        # fleet_direction of 1 represents right; -1 represents left.
        self.fleet_direction = 1

        # Scoring settings
        self.alien_points = 50

    def increase_speed(self):
        """Increase speed settings and alien point values."""
        self.ship_speed *= self.speedup_scale
        self.bullet_speed *= self.speedup_scale
        self.alien_speed *= self.speedup_scale

        self.alien_points = int(self.alien_points * self.score_scale)
